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2. Postcoital contraception with dienoestrol;Szontagh;Med Gynaecol Sociol,1969
3. The effect of large doses of estrogens post coitum in 2000 women;Haspels;Eur J Obstet Gynaecol Reprod Biol,1973
4. The effect of estrogens and related substances on embryonic viability;Blye;Adv Biosci,1970
5. Interception: the use of postovulatory estrogens to prevent implantation;Morris;Am J Obstet Gynecol,1973